by their insurance companies. >> reporter: romney and his running mate, paul ryan, proposed to cut medicaid by the next ten years, give states more control over their medicaid funds. overhaul medicare, people now younger than 55, when they reach retirement would have the option of getting a voucher to purchase private insurance. or they could stick with traditional medicare. >> this is designed to guarantee that seniors can always afford medicare coverage, no exceptions. >> now, there is major differences between the candidates, but perhaps the biggest split is over medicaid. many think of it as a safety net for the poor. but what it actually covers is poor families, pregnant women, people with disabilities as well as senior citizens. there is a lot to talk about. and andrew rubin joins me to talk about it. he oversees the doctors at the medical center. i hope i got it right, thank you for joining us. you know, you and i talked about this before. medicaid covers one in five americans, including more than one in three children. why -- how do you explain this as being a big issue for seniors.